Question

I have a library I was working on have left it for a while, when I went back to work on it, it’s still fine but when I updated gems: mongoid from 2.4.5 to 3.0.6 and also updated mongo and bson_ext from 1.6.0 to 1.7.0 and when run my rspec I get error

<top (required)>': uninitialized constant Mongo (NameError) from

Mongoid.configure do |config|
  config.master = Mongo::Connection.new.db("db_test")
end

I have:
ruby 1.9.3p125
mongodb 2.0.2-x86_64

This one has the same problem
Mongoid gives uninitialized constant Mongo
but the solution didn’t work for me.

Adding require "mongo" on mine gives a different error:


spec_helper.rb:11:in 'block in <top (required)>': undefined method 'master=' for Mongoid::Config:Module (NoMethodError)


EDIT
I still used 3.x and this is now how they do connections

Mongoid.configure do |config|
  config.connect_to("db_test")
end

Answer 1

Mongoid 3.x does not use the mongo gem anymore, it uses a driver called moped developed by the Mongoid team.

If you want to stick with the official 10gen driver you would need to update your Gemfile to specify you want to stick with Mongoid 2.x:

gem "mongoid", "~> 2.0"